AS transport in plant question- need help!!!

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Ryan Ng
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9. The roots of two groups of pea plants were placed in solutions containing radioactive potassium ions. For the experimental plants a respiratory inhibitor was added to the solution. The control plants had no respiratory inhibitor added. At regular intervals the solutions surrounding the roots were tested for radioactive potassium ions.
The table shows the results of this investigation.

Time from placing
roots in solution / Concentration of radioactive potassium
ions in the solutions surrounding the roots /
arbitrary units
minutes Experimental plants Control plants
0 7.5 7.5
15 6.6 3.3
30 6.4 2.9
60 6.3 2.4
120 6.3 1.2
240 6.3 0.6
(i) The rate of uptake of potassium ions by the experimental plants in the first 15 minutes was 0.06 units per minute.
Calculate the rate of uptake of potassium ions by the control plants over the same time period.

(iii)suggest an explanation for the difference between the rate of uptake by both plant in the first 15 minutes

could anyone help?
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